The United States and Japan will step up their defence cooperation to deal with the threat from nuclear-armed North Korea as tensions in East Asia remain high, officials from the two allies said on Thursday.

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Coroner Audrey Jamieson found the three women all died from a LCMV-like virus, which had never been seen in Victoria and hasn't been seen since.

Ms Jamieson said Vranjesevic had spent three months in Serbia where he likely picked up the LCMV-like virus before returning to Australia in late 2006.

He had lost 15kg and suffered headaches and fatigue before his death, which occurred just days after his return.

But Ms Jamieson found the medical checks on Mr Vranjesevic's organs were adequate.

"The screening process which identified Mr Vranjesevic as a suitable donor was reasonable and appropriate in the circumstances and of itself could not have added any additional information that was likely to have altered the outcome," she said.

"I heard no evidence that the organ donation and transplantation procedures in Victoria are not rigorous."

She said the Victorian public had no reason to lose faith in the transplant system.

"Potential donors and their families and recipients, potential recipients and their families have no reason not to have confidence in organ donation and transplant procedures."

Ms Jamieson recommended that the DonateLife group be authorised by hospitals to extend their liaison roles before and after transplant operations.

She also suggested hospital staff needed to communicate better with the families of patients.

"If a family actually knows and understands what is happening during the course of hospitalisation, their ability to come to terms with the death of their loved one greatly improves," she said.